JP3181694B2 - Magnetic head retracting mechanism for magneto-optical disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head retracting mechanism for a magneto-optical disk drive having a magnetic head which can be moved toward and away from a recording disk.

[0002]

2. Description of the Related Art For example, a conventional magneto-optical disk device capable of repeatedly recording information on a magneto-optical disk is provided with vias directed toward a recording layer of the loaded magneto-optical disk.
Bias for initialization by magnetic field generator (magnetic head)
On a magnetic field is applied, continuously converging the larger laser light power emitted from the optical head, the magneto-optical disk
Raise the temperature of the recording layer to the Curie temperature , and
After the coercive force is lost, the recording layer
Magnetization direction is the same as the initialization bias magnetic field,
After the so-called initialization, to reverse the magnetic field intermittently converges the larger laser beam power in the recording layer, thereby recording information by reversing the direction of magnetization.

In the magneto-optical disk device having such a structure, in order to rewrite information of one track, it is necessary to rotate the magneto-optical disk for erasing and recording, respectively, which is disadvantageous in that the recording speed is low. Therefore, recently, by selectively applying a magnetic field of either S or N to a minute region corresponding to a region where laser light is converged, information can be rewritten only by rotating the disk once. A magneto-optical disk device of a modulation overwrite type has been proposed.

Meanwhile, in the magneto-optical disk apparatus of the magnetic field modulation overwrite method, for rapid overwriting realized, it is necessary to apply a magnetic field modulated at a high speed in a magneto-optical disk, magnetic from the characteristics required on The head needs to be miniaturized and very close to the disk recording layer. To realize this, a magnetic head is mounted on a cantilevered row provided on the back of the magnetic head carriage.
In the free state, the magnetic head hangs slightly against the magneto-optical disk, and when it is moved to the loading position, it is bent upward by wind pressure from the rotating magneto-optical disk. , So that it can approach the surface of the magneto-optical disk at a very short distance.

For this reason, in a magneto-optical disk drive of the same type, if the main power supply is turned off due to a power failure or the like while writing information in which the magnetic head is located at the loading position, the magneto-optical disk is driven by the drive motor. Since the rotation is achieved only by inertia without obtaining the rotation force, the rotation is gradually weakened. As a result, the load beam that has warped upward due to the wind pressure of the rotating magneto-optical disk hangs down,
The magnetic head slides on the magneto-optical disk rotating by inertia, and in a severe case, the magnetic head may be damaged.

[0006]

An object of the present invention is to provide a magneto-optical disk drive which prevents a magnetic head from slidingly contacting a magneto-optical disk even when a main power supply is turned off during use of writing or the like based on the above problem awareness. It is an object of the present invention to provide a magnetic head retracting mechanism.

[0007]

SUMMARY OF THE INVENTION The present invention, which achieves the above object, comprises an optical head.
Disk; keeps a disk cartridge with a built-in recording disk.
And hold the disk cartridge in the data close to the optical head.
Unloading position separated from disk loading position
Cartridge holder;
Recording in the disk cartridge independently of the holder
Separated from head access position close to disk
Magnetic head movable to a non-access position;
A possible cam plate; formed on this cam plate,
The disk cartridge and the magnetic head
Position at unloading position and non-access position respectively
First position to be loaded, loading position and non-access position
And the disc loading position
Switch to the third state located at the head access position in reverse order.
Guides cartridge holder and magnetic head in an alternate manner
Cam groove to move from the third state to the second state
Urging means for urging the cam plate to move;
Lock the cam plate against the position corresponding to the third state
Locker that can rotate between lock position and unlock position
Arm; and keeps the lock arm in the locked position when the power is supplied.
Absorptive force to be retained and disappears when no electricity is supplied
The main power is turned off in the third state.
The electromagnetic holding means is de-energized and the lock arm
Allow the rotation to the unlock position, and press the second
When the cam plate moves to the
It is moved from the access position to the non-access position.
are doing. According to this magneto-optical disk drive, the magnetic head
The main power is turned off when the
Also ensure that the magnetic head is separated from the recording disk.
To prevent damage to the disc and head.
it can. The mechanism for retracting the magnetic head is provided with a disk drive.
Works in conjunction with cartridge loading mechanism
Since the components are shared with each other,
Easy structure and operation control of the entire magnetic disk drive
can do.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 15 is a plan view showing a magneto-optical disk drive 20 of the magnetic field modulation overwrite type to which the present invention is applied, and FIG. 1 is a side view thereof. This magneto-optical disk drive 20
The optical head 24 is moved along a cartridge holder 22 for holding a disk cartridge 11 loaded with a magneto-optical disk 12, an optical head 21, and a linear bearing 51 (FIG. 11) provided on the optical head 21. An optical head carriage 23 for moving the magnetic disk 12 in the radial direction (radial direction) and a magnetic head carriage 26 for moving the magnetic head 25 in the radial direction of the magneto-optical disk 12 are provided. Reference numeral 54 in FIG. 15 denotes a shutter of the disk cartridge 11.

The cartridge holder 22 includes an optical head 24
, And can be moved up and down with respect to the optical head 24 when the disc cartridge 11 is attached or detached. When the cartridge holder 22 is pushed to a predetermined position together with the disk cartridge 11, the loading switch 80 (FIG.
5) is turned on, and based on this, the drive motor 61 starts to be driven to move the magneto-optical disk 12 loaded in the disk cartridge 11 to a loading position (disk loading position) for approaching the optical head 24. I have.

On the outside of the cartridge holder 22, guide cam plates 3 arranged on the left and right sides with respect to the moving direction of the disc.
5 are provided. The guide cam plate 35 is guided by a guide roller 50 provided in the apparatus main body, and is moved by arrows A and B in FIG.
It is slidable in the direction. Left and right guide cam plate 3
5 are connected by a connecting plate 81, and have substantially cam-shaped holder cam grooves 40, 42 and a head cam groove 41,
43. Outside the guide cam plate 35, left and right fixed cam plates 49 are provided.
9, a cam groove 40 for the holder of the left and right guide cam plates 35,
Up and down guide cam grooves 45, 47 and 46 are formed in the up and down direction so as to correspond to 42 and the head cam groove 41.

On the left and right sides of the cartridge holder 22 in the disk moving direction, cam pins 36, 3
The cam pin 36 is inserted through the holder cam groove 40 and the vertical guide cam groove 45, and the cam pin 38 is provided.
Are inserted through the holder cam groove 42 and the vertical guide cam groove 47. Cam pins 37 and 39 are provided on the left and right side surfaces of the magnetic head carriage base 28, respectively. The cam pins 37 are inserted into the head cam groove 41 and the vertical guide cam groove 46, and the cam pin 39 is It is inserted into the groove 43.

The cam grooves 40 and 42 for the holder are
An unloading section 40a that holds the disk cartridge 11 at the unloading position while holding the disk cartridges 6 and 38;
42a and the cam pin 3 during the initial movement of the guide cam plate 35.
A moving section 40 for guiding the disk cartridges 6 and 38 to move the disk cartridge 11 to the loading position and hold the disk cartridge 11 at the same position;
b, 42b. The holder cam grooves 40 and 42 are furthermore formed substantially horizontally, and the cam pins 36 and 38 are idlely moved without moving up and down.
At the loading position.

The cam grooves 41 and 43 for the head are
The magnetic head 25 (magnetic head carriage 26) is held at the unloading position (non-access position) while holding the heads 7 and 39.
And the cam pins 37, 39 are guided during the initial movement of the guide cam plate 35, and the magnetic head 25 is moved to an intermediate position (non-access position) between the unloading position and the loading position (head access position).
( Moving portions 41b, 43b ) for moving to the intermediate step portions 41c, 43c (i.e., the main positions) . Head cam groove 4
Moving parts 41d and 43d further guide the cam pins 37 and 39 to move the magnetic head 25 to the loading position at the time of movement following the initial movement of the guide cam plate 35.
Loading portions 41e and 43 for holding the magnetic head 25 at the loading position by holding the cam pins 37 and 39.
e.

Connecting plate 8 for connecting left and right guide cam plates 35
Guide rollers 5 provided on the apparatus main body side are provided at the four corners 1.
A sliding groove 92 which engages with the guide roller 50 and slides with respect to the guide roller 50 is formed. The connecting plate 81 has a guide cam plate 35 integrally formed on one side and a guide cam plate 35 on the other side.
Are screwed so as to have a positional relationship corresponding to the guide cam plate 35 on one side (see FIG. 10). Connecting plate 81
An engagement notch 98 for projecting and engaging the lock projection 93a of the lock arm 93 is formed on the side portion 81a to which the guide cam plate 35 is screwed. An engagement notch 98 ′ is formed at a position corresponding to the engagement notch 98.

The apparatus main body includes first and second detection switches 6
A switch operation plate 67 for operating switch levers 65a, 66a of the first and second detection switches 65, 66 on the back surface of the connecting plate 81;
A drive plate 83 that is engaged with the drive transmission pins 86a and 86b and transmits the driving force is fixed. The drive plate 83 has three engagement teeth 83a, 83b, 83c, and an engagement gap 84a between the engagement teeth 83a and 83b, and an engagement tooth 83b.
The distance between the engagement gap 84b between the engagement teeth 83c and the engagement teeth 8c
It is configured to be substantially the same as the distance between 6a and 86b.

The detection switches 65 and 66 are provided on the guide cam plate 3.
The switch levers 65a and 66a are pressed or released by the switch operation plate 67 which moves together with the switch 5 to be turned on or off, and the position of the guide cam plate 35 is detected based on this. With this detection, it is possible to detect which state the disk cartridge 11 and the magnetic head carriage base 28 are currently in. That is, the switch operation plate 67 turns off the first detection switch 65 and turns on the second detection switch 66 in the state of FIG. 1, and switches the first detection switch 65 and the second detection switch in the state of FIG. 3 can be turned on, and in the state of FIG. 3, the first detection switch 65 can be turned on and the second detection switch 66 can be turned off.

These different bit signals are discriminated by a discriminating circuit (not shown), and the magneto-optical disk drive 20 is discriminated.
However, when the magnetic head 25 and the disk cartridge 11 are both in the unloading position and the disk cartridge 11
Disk cartridge 1 in a detachable state in which the disk can be detached
1 is located at the loading position and the magnetic head 25 is located between the unloading position and the loading position, in a reproducible state in which reproduction using only the optical head 24 is possible. It is possible to determine which of the recorded / reproducible states has been set.

The apparatus main body is further provided with a drive motor 61 and a drive gear 85 for transmitting the rotation of a pinion gear 61a attached to the rotation shaft of the drive motor 61 via a large and small gear 87. The large and small gear 87 has a large diameter gear 87a that meshes with the pinion gear 61a, and a small diameter gear 87b that meshes with the drive gear 85. The drive gear 85 is provided with the drive transmission pins 8 provided at both ends of the diameter.
6a and 86b.

In the vicinity of the driving gear 85, an inverted L-shaped fixing plate 9 is provided.
The fixing plate 99 has a sliding guide slot 99a formed therein. In this sliding guide slot 99a,
A slide pin 88c fixed to the slide plate 88 is engaged. When the slide pin 88c moves in the slide guide slot 99a, the slide plate 88 moves in the same direction as the moving direction of the connecting plate 81. You can move. The slide plate 88 has an engagement hole 88a formed at one end thereof, and the other end thereof is provided with the other end of a tension spring 89 having one end fixed to the apparatus body by a screw 91. Further, a moving urging pin 82 is fixed to the back surface of the connecting plate 81 at a position corresponding to the engaging hole 88a. In a state where the moving urging pin 82 is engaged with the engaging hole 88a, the urging force in the direction of returning the magnetic head carriage 26 to the unloading position can be applied to the guide cam plate 35.

A substantially L-shaped lock arm 93 is rotatably supported on the fixed plate 99 so that its bent portion can be rotated. The other end of a tension spring 97 having one end attached to the fixed plate 99 side is attached to the lock arm 93, whereby the lock arm 93 is attached to the armature 95.
15 in the clockwise direction in FIG.
(A lock position described later) . This pull
The biasing force of the tension spring 97 is determined by the tension spring 89.
It is set smaller than the urging force applied to the inner cam plate 35.
You. The electromagnet 96 is provided on the inner side of the device
Is provided, the electromagnets 96, when energized
Is excited to generate an attractive force against the armature 95
Then, it is demagnetized when the power supply is released . When the main power supply of the magneto-optical disk drive 20 is
The power to the electromagnet 96 when the
Since the supply is cut off, the electromagnet 96 is demagnetized.

Used for the magneto-optical disk drive 20 of this embodiment.
Possible magneto-optical disks 12 include International Standard (ISO)
Double-sided disk and dedicated to the disk device 20 (non-ISO)
There is a single-sided disc. Of these discs, international
Optical code for disc identification on standard double-sided disc
Although no new signal can be written, this magneto-optical
The single-sided disk dedicated to the disk drive 20 has this optical code signal.
Number, for example, on the inner control track
Is possible. This double-sided disc or single-sided
The optical code signal indicating whether the disc is
The ridge 11 is at the loading position and the magnetic head 25 is
In the state of FIG. 2 waiting at the intermediate position,
Read by the disk 24 into the disc discriminating means 68 (FIG. 15).
It is impregnated. Therefore, when the optical code signal is read
Is the magneto-optical disc loaded by the disc discriminating means 68.
The air disk 12 is determined to be for one side. Based on this
Then, the drive motor 61 is driven to rotate forward and the guide cam plate 35
Is further moved in the same direction, and thereby the magnetic head 25 is moved.
Is moved to the loading position for reading and recording.
Functioning state. In addition, in the state of FIG.
If an optical code signal is not read by the disc discriminating means 68,
In this case, the loaded magneto-optical disk 12 is used for both sides.
Is determined. In this case, the drive motor 61 is not driven,
Since the guide cam plate 35 is not moved any further, the magneto-optical
The disk device 20 allows only reading by the optical head 24
It will be in a working state.

As shown in FIG. 11, the optical head carriage 23 is movably supported along the radial direction (radial direction) of the magneto-optical disk 12 via a linear bearing 51. It is driven by a linear motor having coils 52 fixed at both ends arranged around a magnetic circuit 53. The linear bearing 51 includes a fixed member 71, a movable member 72, and a ball 7 interposed between the fixed member 71 and the movable member 72.
3. The fixed member 71 is a substantially U-shaped and elongated member attached to the optical head unit 21 side, and the movable member 72 is attached to the optical head carriage 23 side, It is a member that is narrow, approximately U-shaped and long. Rolling grooves are formed on opposing side surfaces of the fixed member 71 and the movable member 72, and a ball 73 is fitted between the opposing rolling grooves.

The optical head 24, a pair objective lens converges the light beam from the laser light source to the magneto-optical disk 12,
At the time of reproduction, the reflected light from the magneto-optical disk 12 is received and the magneto-optical recording signal is read, and at the time of recording, the laser light is converged on the magneto-optical disk 12 with a larger power than at the time of reproduction to raise the temperature of the recording layer to the Curie temperature. Then, the information is overwritten on the recording layer in cooperation with the magnetic head 25.

The magnetic head carriage 26 is movably supported in the radial direction (radial direction) of the magneto-optical disk 12 by a linear bearing 55 attached to the magnetic head carriage base 28. Is driven by a linear motor configured by arranging a coil 56 fixed around the magnetic circuit 57. The linear bearing 55 is fixed to the fixing member 7.
5, the movable member 76 and the fixed member 75 and the movable member 76
And a ball 77 interposed therebetween.
The fixing member 75 is attached to the optical head 21 side,
The movable member 76 is attached to the optical head carriage 23 side, is narrower than the fixed member 75, and has a substantially U-shaped and long shape. It is the member which was done. These fixed member 75 and movable member 76
Rolling grooves are formed on the opposing side surfaces of the
A ball 77 is fitted between the opposing rolling grooves.

At the end of the magnetic head carriage 26, two sets of photoreflectors 3 having both light emitting / receiving elements are provided.
Reference numerals 0 and 31 are provided, and a reflector 32 is attached to a tip of a reflector holder 27 extending in the moving direction of the optical head carriage 23. Both carriages 23, 2
Reference numeral 6 is set so that the positions of the heads 24 and 25 coincide when the outputs from the two light receiving elements are equal.

The optical head carriage 23 is also driven in the radial direction of the magneto-optical disk 12 by a signal from a control device (not shown), and the magnetic head carriage 26 is driven by a synchronous circuit (not shown) by two light receiving elements. Are controlled so that the outputs from the. Thereby, the magnetic head carriage 26 can be moved in synchronization with the optical head carriage 23.

FIGS. 13 and 14 are enlarged views of the vicinity of the magnetic head 25 of the air floating type. On the back surface of the magnetic head carriage 26, a cantilevered load beam 15 is provided.
Its base is the disk rotation center 12 of the magneto-optical disk 12.
It is fixed to the a side by a fixing screw 69.
A magnetic head 25 is attached to a free end of the load beam 15 facing the outer periphery of the magneto-optical disk 12. At the removable position in FIG. 1, the load beam 15 bends downward until it comes into contact with the magnetic head holding plate 70, and as shown in FIG. 13, the load beam 15 is inclined slightly downward . In this state, the drive motor 61 is driven
And the guide cam plate 35 slides, thereby
The cartridge 11 is lowered to a predetermined position. Then the magneto-optical
The disk 12 is rotated.
Magnet with air-floating slider surface approaching 12
The head 25 rotates with the load by the load beam 15.
Stable at the position where the wind pressure by the magneto-optical disk 12 is balanced
Then, it becomes substantially parallel to the magneto-optical disk 12 and comes close to the surface of the disk 12 at a very short distance as shown in FIG.

In the present magneto-optical disk drive having the above-described configuration, when the disk cartridge 11 is to be attached or detached,
The cartridge holder 22 and the magnetic head 25 are as shown in FIG.
Is held in place. At this time, the cartridge holder 22
The cam pins 36, 38 are engaged with the holder cam grooves 40, 42.
The magnetic head 2 is located at the loading portions 40a and 42a.
5 (magnetic head carriage 26) side cam pins 37, 3
9 is an unloading portion of the cam grooves 41 and 43 for the head.
41a and 43a. In other words, the disc cartridge
The head 11 is separated from the optical head 24, and the magnetic head 25 is also
The magneto-optical disk 12 in the disk cartridge 11
It is in a position (non-access position) that is separated from it. This cart
From the state where the ridge can be removed (the first state),
The disc cartridge 11 is loaded into the holder 22 and
The loading switch 80
Is turned on, the drive motor 61 is driven to rotate in the normal rotation direction, and the rotation is performed by the pinion gear 61 a and the large and
Is transmitted to the drive gear 85 via the Then, in FIG. 1, the drive transmission pin 86b engages with the engagement gap 84a to move the drive plate 83, that is, the guide cam plate 35 in the direction A in FIG. Then, the drive motor 61 is temporarily stopped when the drive gear 58 makes a half rotation.

[0029] Thus, the guide disk cartridge 11 that was in the unloading position in the initial position of the cam plate 35 is turned accompanied the initial movement of the guide cam plate 35, the cam pin 36, 38 the holder cam grooves 40, 42 The guide rollers 50 are guided by the moving portions 40b and 42b of the optical head 21 and serve as reference surfaces provided on the optical head 21.
Down until it comes into contact with the upper surface 50a. That is,
The disk cartridge 11 (the magneto-optical disk 12 in the disk cartridge)
The disk loading position close to the head 24
You. At this time, similarly to the disc cartridge 11, the magnetic head 25 that were in the unloading position in the initial position of the guide cam plate 35 is turned accompanied the initial movement of the guide cam plate 35, cam for the cam pin 37, 39 heads Groove 4
Moving portion 41b of 1,43, guided by 43 b, the mosquito
The arm pins 37 and 39 intermediate step portion 41c, is so positioned 43c to wait at the intermediate position of the unloading position and a loading position. As shown in FIGS. 1 to 3 and FIG.
As described above, the moving portions 41b, 4b of the head cam grooves 41, 43
3b and moving portions 40b, 42 of holder cam grooves 40, 42
b is inclined almost in parallel, and this unloading position
Head 25 and the disk in the movement from the position to the intermediate position.
Relative distance between disc cartridges 11 (magneto-optical discs 12)
The septum is substantially different from the cartridge detachable state described above.
Does not change. That is, the magnetic head 25 is still
To a non-access position separated from the magneto-optical disk 12.
Is held.

In this state (second state) , the switch operation plate 67 which moves together with the guide cam plate 35 releases the switch levers 65a and 66a, so that both the first detection switch 65 and the second detection switch 66 are connected. Turned off. Based on this, the cam groove 40 for the holder of the guide cam plate 35,
42 detects that the cartridge holder 22 has been moved to the loading position, and the head cam grooves 41 and 43 detect that the magnetic head 25 has been moved to an intermediate position between the unloading position and the loading position.

In this state, the optical head 24
Optical code signal written in the circumferential side within the magneto-optical disk 23 is loaded, on the basis of the optical code signal, the disc
The determining means 86 determines whether the loaded magneto-optical disk 12 is for one side or for both sides. As a result, if it is determined that the magneto-optical disk 12 is for both sides, the drive motor 61 is not driven, and the guide cam plate 35 is not moved any further.
4 can be read only. On the other hand, when it is determined that the magneto-optical disk 12 is for one-sided use, the drive motor 61 is driven to rotate forward again, whereby the drive gear 85 is further rotated half a turn, and is located at a position opposite to that of FIG. The drive transmission pin 86a engages with the engagement gap 84b, and moves the guide cam plate 35 in the direction of arrow A in FIG. As a result, the magnetic head 25 approaches the magneto-optical disk 12
The optical head 24 and the magnetic head are completely lowered to the position.
25 are both close to the magneto-optical disk 12 for recording and
The recording / reproducing state in which reproduction is possible (third state).

On the other hand, in the above-mentioned detachable state, the slide plate 88 has its slide pin 88c in the slide guide slot 99a opposite to the moving direction of the guide cam plate 35 as shown in FIGS. In the direction (one end side), the movement urging pin 82 on the back surface of the connecting plate 81 is located at a position away from the engagement hole 88a as shown in FIG.
No biasing force of 9 was applied. In this state, the electromagnet 96 is accompanied not energized on the main power supply flax
Generating an attraction force to the armature 95, and
The lock arm 93 with the lock 95
7 is urged clockwise in FIGS. 4 and 7.
You. However, the engagement notch 98 formed in the guide cam plate 35
Has been moved and the lock projection 93a of the lock arm 93 has been moved.
Is not at the position corresponding to
Lock position for engaging the lock projection 93a with the engagement notch 98
Cannot be rotated to the position,
Therefore, the counterclockwise direction in FIG.
It is pushed into an unlock position separated from the electromagnet 96 .

When the magneto-optical disk drive 20 is brought into a reproducible state by the movement of the guide cam plate 35, as shown in FIGS. 5 and 8, the engagement holes 88a of the slide plate 88 are formed.
The moving urging pin 82 on the back surface of the connecting plate 81 is engaged with the connecting plate 81. This
Lock arm 93 is in unlock position even when
Is held in place.

In this state, when the guide cam plate 35 is further moved in the same direction, as shown in FIGS. 6 and 9, the movable urging pin 82 which moves together with the guide cam plate 35 causes the tension spring 89 to move. Starts moving the slide plate 88 in the same direction. When the drive gear 85 makes a half turn, the movement urging pin 82 causes the slide pin 88c of the slide plate 88 to move most in the movement direction (the other end) of the guide cam plate 35 in the slide guide slot 99a. Move. At this time, since the engagement notch 98 is located at a position corresponding to the lock arm 93, the lock arm 93 is
The lock arm 93 is inserted into the engagement notch 98 and rotated clockwise by the urging force of. Then, since the armature 95 is attracted to the electromagnet 96 in the excited state, the lock arm 93 positions the lock projection 93a in the engagement notch 98 as shown in FIGS. The guide cam plate 35 to be returned by the spring 89 is held at the position where the magnetic head carriage 26 and the cartridge holder 22 are moved to the loading position.

In this state (third state) , when the main power supply is turned off due to a power failure or the like while the magneto-optical disk device 20 is used, the electromagnet 96 is demagnetized and the armature 95 is released, so that the armature 95 is released. The arm 93 loses the force that has locked the guide cam plate 35 to be returned by the urging force of the tension spring 89 . This allows the tension splice
The guide cam plate 35 is driven by the urging force of the
Move toward the position where only playback is possible (second state)
I do. At this time, the lock arm 93 is a side plate of the connecting plate 81.
81a to rotate to the unlock position
You. The lock arm 93 is moved by a tension spring 97.
To lock the guide cam plate 35 in the locking direction.
The biasing force of the tension spring 97 is
Is weaker than the urging force of the
When the contact force is lost, the guide cam plate 35 is locked.
The locking action of the arm 93 is eliminated. Tension spring 89
The urging force of the sliding pin 88c is caused by the sliding guide slot 99a.
At the time of contact with one end of the guide cam plate 35, that is, at the time, that is, in the reproducible state (second state) shown in FIGS. The movement of the plate 35 is stopped. That
Result, loading position (disk loading position)
The magnetic disk carriage 11 holding the magnetic head 25 immediately rises by one step by a spring force without depending on the electric power, and moves to the non-access position to the magneto-optical disk 12.
Be moved. Therefore, the magneto-optical disk 1 rotating by inertia
The problem that the magnetic head 25 slides on 2 is reliably prevented.

[0036] In the above description, the electromagnet 96 is mainly
This is supposed to be demagnetized when the power is turned off.
This arbitrarily demagnetizes the electromagnet 96 when the main power is on.
This does not exclude the possibility of separately providing operation means.
For example, it is necessary to provide operating means for turning off the electromagnet.
And the above recording / playback state even when the main power is on.
Transition from (third state) to reproducible state (second state)
The line becomes possible. Of course, providing such operating means
The main power is suddenly turned off in the recording / playback state.
In the event of abnormal operation such as
The evacuating operation is reliably performed without depending on the electric power.

As described above, according to the present invention, even if the main power supply is turned off when the magnetic head is positioned at the loading position (head access position) and information is written, recording on a magneto-optical disk or the like is performed. The magnetic head (magnetic head carriage) that has been brought close to the disk is
It can be immediately separated from this recording disk without being present . Therefore, on a recording disk that rotates by inertia,
Problems such as sliding the magnetic head can be reliably prevented. The retracting mechanism of this magnetic head is
Load the disc cartridge into the loading position for the optical head.
For moving to the loading and unloading position
Operates in cooperation with the loading mechanism and its components
Are shared with each other, so the magneto-optical disk drive
Can be simplified in structure and operation control.

[Brief description of the drawings]

FIG. 1 is a side view showing a magneto-optical disk device of this embodiment in a detachable state.

FIG. 2 is a side view showing the magneto-optical disk drive in a reproducible state.

FIG. 3 is a side view showing the magneto-optical disk device of the embodiment in a recording / reproducing state.

FIG. 4 is a perspective view showing a main part of the magneto-optical disk device of FIG. 1;

FIG. 5 is a perspective view showing a main part of the magneto-optical disk device of FIG. 2;

FIG. 6 is a perspective view showing a main part of the magneto-optical disk device of FIG. 3;

FIG. 7 is a plan view showing a main part of the magneto-optical disk device of FIG. 1;

FIG. 8 is a plan view showing a main part of the magneto-optical disk device of FIG. 2;

FIG. 9 is a plan view showing a main part of the magneto-optical disk device of FIG. 3;

FIG. 10 is a perspective view showing a main part of the magneto-optical disk device corresponding to FIG. 7;

11 is a diagram showing the magneto-optical disk device of FIG. 1 as viewed from the direction of arrow D in FIG.

12 is a diagram showing the magneto-optical disk device of FIG. 3 as viewed from the direction of arrow D in FIG.

FIG. 13 is a side view showing the vicinity of the magnetic head when the magneto-optical disk device of the embodiment is in a detachable state.

FIG. 14 is a side view showing the vicinity of the magnetic head when the magneto-optical disk device of the embodiment is in a recording / reproducing state.

FIG. 15 is a plan view showing the entire magneto-optical disk device of the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Disk cartridge 12 Magneto-optical disk 20 Magneto-optical disk drive 22 Cartridge holder 23 Optical head carriage 24 Optical head 25 Magnetic head 26 Magnetic head carriage 28 Magnetic head carriage base 35 Guide cam plate 36 37 38 39 Cam pin 40 42 Cam groove 41 for holder 43 Head cam groove 40a 42a 41a 43a Unloading part 40b 41b 42b 43b Moving part 40c 41e 42c 43e Loading part 41c 43c Middle step part 41d 43d Moving part 45 46 47 Vertical guide cam groove 49 Fixed cam plate 50 Guide roller 61 Motor 65 First detection switch 66 Second detection switch 67 Switch operation plate 81 Connecting plate 81a Side 82 Moving urging pin 83 Driving plate 83a 83b 83 Teeth 84a 84b engage the gaps 85 driving gear 86a 86b drive transmission pin 87 magnitude gear 88 slide plate 88a engaging hole 88b spring attachment portion 88c slide pin 89 tension springs (urging means) 92 sliding groove 93 lock arm 93a Lock protrusion 95 Armature (electromagnetic holding means) 96 Electromagnet (electromagnetic holding means) 97 Extension spring (arm biasing spring) 98 Engagement notch (engagement part) 99 Fixing plate 99a Sliding guide slot

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shun Takishima 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Industry Co., Ltd. (56) References JP-A-2-96990 (JP, A) JP-A-4-311845 (JP, A) JP-A-5-12742 (JP, A) JP-A-4-157661 (JP, A) JP-A-4-163759 (JP, A) JP-A-5-101507 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 21/12 G11B 11/105 G11B 17/04

Claims (4)

(57) [Claims] An optical head for holding a disk cartridge containing a recording disk.
And bringing the disk cartridge close to the optical head.
Unloading separated from disc loading position
Position of the cartridge holder; independently of the cartridge holder,
Head unit close to the recording disk in the cartridge
Magnet that can be moved between an access position and a non-access position
Air head; reciprocally movable cam plate; this is formed in the cam plate, in accordance with the reciprocating movement of the cam plate,
Make sure that the disk cartridge and magnetic head are
First state located at loading position and non-access position
Position, the loading position and the non-access position.
And the disc loading position and head
Switch to the third state at the access position in reverse order
Guide the cartridge holder and the magnetic head
Cam groove; upward in the direction of shifting from the third state to the second state.
Biasing means for moving and biasing the cam plate; and moving the cam plate in a third state against the biasing means.
Between the locked position and the unlocked position.
Rotatable lock arm; and suction for holding the lock arm in the locked position when energized
Electromagnetic holding hand that generates force and loses the attracting force when power is not supplied
Stage; equipped with, when the main power is turned off by the third state, the electromagnetic coercive
The holding means is de-energized and the lock arm is unlocked.
To the second position by the biasing means.
The movement of the cam plate causes the magnetic head to
Moving from the access position to the non-access position.
Magnetic head retracting mechanism of a magneto-optical disk drive. (2) The magnetic head retracting mechanism according to claim 1
And the lock arm is in the first and second states.
Is the cam plate regardless of the energized state of the electromagnetic holding means.
Is pressed to the unlock position by the third
Only in state The cam plate by rotating to the lock position.
Head of the magneto-optical disk drive that can be engaged with the head
Escape mechanism. (3) The magnetic head retracting mechanism according to claim 2
And further urges the lock arm to the lock position.
Arm urging spring having an urging force weaker than the urging means.
Prepared, The cam moves in a direction to shift from the second state to the third state.
When the plate moves, it is locked by the arm biasing spring.
The arm of the magneto-optical disk drive where the arm is moved to the lock position.
Magnetic head retracting mechanism. (4) 4. The magnet according to claim 1, wherein
In the air head retracting mechanism, the cam groove of the cam plate is
Between the first and second states.
And the magnetic head are moved by approximately the same amount with respect to the optical head.
Has a shape, The magnetic head is in the non-access position in the first state.
And the optical head in the non-access position in the second state
The magnetic head of a magneto-optical disk
Evacuation mechanism.